release/src-rt-6.x.4708/toolchains/hndtools-arm-linux-2.6.36-uclibc-4.5.3/arm-brcm-linux-uclibcgnueabi/sysroot/usr/include/signal.h

   1 /* Copyright (C) 1991-2003, 2004 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 /*
  20  *      ISO C99 Standard: 7.14 Signal handling <signal.h>
  21  */
  22
  23 #ifndef _SIGNAL_H
  24
  25 #if !defined __need_sig_atomic_t && !defined __need_sigset_t
  26 # define _SIGNAL_H
  27 #endif
  28
  29 #include <features.h>
  30
  31 __BEGIN_DECLS
  32
  33 #include <bits/sigset.h>                /* __sigset_t, __sig_atomic_t.  */
  34
  35 /* An integral type that can be modified atomically, without the
  36    possibility of a signal arriving in the middle of the operation.  */
  37 #if defined __need_sig_atomic_t || defined _SIGNAL_H
  38 # ifndef __sig_atomic_t_defined
  39 #  define __sig_atomic_t_defined
  40 __BEGIN_NAMESPACE_STD
  41 typedef __sig_atomic_t sig_atomic_t;
  42 __END_NAMESPACE_STD
  43 # endif
  44 # undef __need_sig_atomic_t
  45 #endif
  46
  47 #if defined __need_sigset_t || (defined _SIGNAL_H && defined __USE_POSIX)
  48 # ifndef __sigset_t_defined
  49 #  define __sigset_t_defined
  50 typedef __sigset_t sigset_t;
  51 # endif
  52 # undef __need_sigset_t
  53 #endif
  54
  55 #ifdef _SIGNAL_H
  56
  57 #include <bits/types.h>
  58 #include <bits/signum.h>
  59
  60 /* Fake signal functions.  */
  61 #define SIG_ERR    ((__sighandler_t) -1) /* Error return.  */
  62 #define SIG_DFL    ((__sighandler_t) 0)  /* Default action.  */
  63 #define SIG_IGN    ((__sighandler_t) 1)  /* Ignore signal.  */
  64 #ifdef __USE_UNIX98
  65 # define SIG_HOLD  ((__sighandler_t) 2)  /* Add signal to hold mask.  */
  66 #endif
  67 /* Biggest signal number + 1 (including real-time signals).  */
  68 #ifndef _NSIG /* if arch has not defined it in bits/signum.h... */
  69 # define _NSIG 65
  70 #endif
  71 #ifdef __USE_MISC
  72 # define NSIG _NSIG
  73 #endif
  74 /* Real-time signal range */
  75 #define SIGRTMIN   (__libc_current_sigrtmin())
  76 #define SIGRTMAX   (__libc_current_sigrtmax())
  77 /* These are the hard limits of the kernel.  These values should not be
  78    used directly at user level.  */
  79 #ifndef __SIGRTMIN /* if arch has not defined it in bits/signum.h... */
  80 # define __SIGRTMIN 32
  81 #endif
  82 #define __SIGRTMAX (_NSIG - 1)
  83
  84
  85 #if defined __USE_XOPEN || defined __USE_XOPEN2K
  86 # ifndef __pid_t_defined
  87 typedef __pid_t pid_t;
  88 #  define __pid_t_defined
  89 # endif
  90 # ifndef __uid_t_defined
  91 typedef __uid_t uid_t;
  92 #  define __uid_t_defined
  93 # endif
  94 #endif  /* Unix98 */
  95
  96
  97 /* Type of a signal handler.  */
  98 typedef void (*__sighandler_t) (int);
  99 #if defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
 100 /* The X/Open definition of `signal' specifies the SVID semantic.  Use
 101    the additional function `sysv_signal' when X/Open compatibility is
 102    requested.  */
 103 extern __sighandler_t __sysv_signal (int __sig, __sighandler_t __handler)
 104      __THROW;
 105 # ifdef __USE_GNU
 106 extern __sighandler_t sysv_signal (int __sig, __sighandler_t __handler)
 107      __THROW;
 108 # endif
 109 #endif /* __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__ */
 110
 111 /* Set the handler for the signal SIG to HANDLER, returning the old
 112    handler, or SIG_ERR on error.
 113    By default `signal' has the BSD semantic.  */
 114 __BEGIN_NAMESPACE_STD
 115 #if defined __USE_BSD || !defined __UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL__
 116 extern __sighandler_t signal (int __sig, __sighandler_t __handler)
 117      __THROW;
 118 #else
 119 /* Make sure the used `signal' implementation is the SVID version. */
 120 # ifdef __REDIRECT_NTH
 121 extern __sighandler_t __REDIRECT_NTH (signal,
 122                                       (int __sig, __sighandler_t __handler),
 123                                       __sysv_signal);
 124 # else
 125 #  define signal __sysv_signal
 126 # endif
 127 #endif
 128 __END_NAMESPACE_STD
 129
 130 #if defined __USE_XOPEN && defined __UCLIBC_SUSV3_LEGACY__
 131 /* The X/Open definition of `signal' conflicts with the BSD version.
 132    So they defined another function `bsd_signal'.  */
 133 extern __sighandler_t bsd_signal (int __sig, __sighandler_t __handler)
 134      __THROW;
 135 #endif
 136
 137 /* Send signal SIG to process number PID.  If PID is zero,
 138    send SIG to all processes in the current process's process group.
 139    If PID is < -1, send SIG to all processes in process group - PID.  */
 140 #ifdef __USE_POSIX
 141 extern int kill (__pid_t __pid, int __sig) __THROW;
 142 #endif
 143
 144 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 145 /* Send SIG to all processes in process group PGRP.
 146    If PGRP is zero, send SIG to all processes in
 147    the current process's process group.  */
 148 extern int killpg (__pid_t __pgrp, int __sig) __THROW;
 149 #endif
 150
 151 __BEGIN_NAMESPACE_STD
 152 /* Raise signal SIG, i.e., send SIG to yourself.  */
 153 extern int raise (int __sig) __THROW;
 154 __END_NAMESPACE_STD
 155
 156 #ifdef __USE_SVID
 157 /* SVID names for the same things.  */
 158 extern __sighandler_t ssignal (int __sig, __sighandler_t __handler)
 159      __THROW;
 160 extern int gsignal (int __sig) __THROW;
 161 #endif /* Use SVID.  */
 162
 163 #ifdef __USE_MISC
 164 /* Print a message describing the meaning of the given signal number.  */
 165 extern void psignal (int __sig, __const char *__s);
 166 #endif /* Use misc.  */
 167
 168
 169 /* The `sigpause' function has two different interfaces.  The original
 170    BSD definition defines the argument as a mask of the signal, while
 171    the more modern interface in X/Open defines it as the signal
 172    number.  We go with the BSD version unless the user explicitly
 173    selects the X/Open version.
 174
 175    This function is a cancellation point and therefore not marked with
 176    __THROW.  */
 177 extern int __sigpause (int __sig_or_mask, int __is_sig);
 178
 179 #ifdef __FAVOR_BSD
 180 /* Set the mask of blocked signals to MASK,
 181    wait for a signal to arrive, and then restore the mask.  */
 182 extern int sigpause (int __mask) __THROW __attribute_deprecated__;
 183 # define sigpause(mask) __sigpause ((mask), 0)
 184 #else
 185 # ifdef __USE_XOPEN
 186 /* Remove a signal from the signal mask and suspend the process.  */
 187 #  define sigpause(sig) __sigpause ((sig), 1)
 188 # endif
 189 #endif
 190
 191
 192 #ifdef __USE_BSD
 193 /* None of the following functions should be used anymore.  They are here
 194    only for compatibility.  A single word (`int') is not guaranteed to be
 195    enough to hold a complete signal mask and therefore these functions
 196    simply do not work in many situations.  Use `sigprocmask' instead.  */
 197
 198 /* Compute mask for signal SIG.  */
 199 # define sigmask(sig)   __sigmask(sig)
 200
 201 /* Block signals in MASK, returning the old mask.  */
 202 extern int sigblock (int __mask) __THROW;
 203 /* collides with libc_hidden_proto: __attribute_deprecated__; */
 204
 205 /* Set the mask of blocked signals to MASK, returning the old mask.  */
 206 extern int sigsetmask (int __mask) __THROW;
 207 /* collides with libc_hidden_proto: __attribute_deprecated__; */
 208
 209 /* Return currently selected signal mask.  */
 210 extern int siggetmask (void) __THROW __attribute_deprecated__;
 211 #endif /* Use BSD.  */
 212
 213
 214 #ifdef __USE_GNU
 215 typedef __sighandler_t sighandler_t;
 216 #endif
 217
 218 /* 4.4 BSD uses the name `sig_t' for this.  */
 219 #ifdef __USE_BSD
 220 typedef __sighandler_t sig_t;
 221 #endif
 222
 223 #ifdef __USE_POSIX
 224
 225 # ifdef __USE_POSIX199309
 226 /* We need `struct timespec' later on.  */
 227 #  define __need_timespec
 228 #  include <time.h>
 229
 230 /* Get the `siginfo_t' type plus the needed symbols.  */
 231 #  include <bits/siginfo.h>
 232 # endif
 233
 234 /* Clear all signals from SET.  */
 235 extern int sigemptyset (sigset_t *__set) __THROW __nonnull ((1));
 236
 237 /* Set all signals in SET.  */
 238 extern int sigfillset (sigset_t *__set) __THROW __nonnull ((1));
 239
 240 /* Add SIGNO to SET.  */
 241 extern int sigaddset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
 242
 243 /* Remove SIGNO from SET.  */
 244 extern int sigdelset (sigset_t *__set, int __signo) __THROW __nonnull ((1));
 245
 246 /* Return 1 if SIGNO is in SET, 0 if not.  */
 247 extern int sigismember (__const sigset_t *__set, int __signo)
 248      __THROW __nonnull ((1));
 249
 250 # ifdef __USE_GNU
 251 /* Return non-empty value is SET is not empty.  */
 252 extern int sigisemptyset (__const sigset_t *__set) __THROW __nonnull ((1));
 253
 254 /* Build new signal set by combining the two inputs set using logical AND.  */
 255 extern int sigandset (sigset_t *__set, __const sigset_t *__left,
 256                       __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
 257
 258 /* Build new signal set by combining the two inputs set using logical OR.  */
 259 extern int sigorset (sigset_t *__set, __const sigset_t *__left,
 260                      __const sigset_t *__right) __THROW __nonnull ((1, 2, 3));
 261 # endif /* GNU */
 262
 263 /* Get the system-specific definitions of `struct sigaction'
 264    and the `SA_*' and `SIG_*'. constants.  */
 265 # include <bits/sigaction.h>
 266
 267 /* Get and/or change the set of blocked signals.  */
 268 extern int sigprocmask (int __how, __const sigset_t *__restrict __set,
 269                         sigset_t *__restrict __oset) __THROW;
 270
 271 /* Change the set of blocked signals to SET,
 272    wait until a signal arrives, and restore the set of blocked signals.
 273
 274    This function is a cancellation point and therefore not marked with
 275    __THROW.  */
 276 extern int sigsuspend (__const sigset_t *__set) __nonnull ((1));
 277
 278 /* Get and/or set the action for signal SIG.  */
 279 extern int sigaction (int __sig, __const struct sigaction *__restrict __act,
 280                       struct sigaction *__restrict __oact) __THROW;
 281
 282 /* Put in SET all signals that are blocked and waiting to be delivered.  */
 283 extern int sigpending (sigset_t *__set) __THROW __nonnull ((1));
 284
 285
 286 /* Select any of pending signals from SET or wait for any to arrive.
 287
 288    This function is a cancellation point and therefore not marked with
 289    __THROW.  */
 290 extern int sigwait (__const sigset_t *__restrict __set, int *__restrict __sig)
 291      __nonnull ((1, 2));
 292
 293 # if defined __USE_POSIX199309 && defined __UCLIBC_HAS_REALTIME__
 294 /* Select any of pending signals from SET and place information in INFO.
 295
 296    This function is a cancellation point and therefore not marked with
 297    __THROW.  */
 298 extern int sigwaitinfo (__const sigset_t *__restrict __set,
 299                         siginfo_t *__restrict __info) __nonnull ((1));
 300
 301 /* Select any of pending signals from SET and place information in INFO.
 302    Wait the time specified by TIMEOUT if no signal is pending.
 303
 304    This function is a cancellation point and therefore not marked with
 305    __THROW.  */
 306 extern int sigtimedwait (__const sigset_t *__restrict __set,
 307                          siginfo_t *__restrict __info,
 308                          __const struct timespec *__restrict __timeout)
 309      __nonnull ((1));
 310
 311 /* Send signal SIG to the process PID.  Associate data in VAL with the
 312    signal.  */
 313 extern int sigqueue (__pid_t __pid, int __sig, __const union sigval __val)
 314      __THROW;
 315 # endif /* Use POSIX 199306.  */
 316
 317 #endif /* Use POSIX.  */
 318
 319 #ifdef __USE_BSD
 320
 321 # ifdef __UCLIBC_HAS_SYS_SIGLIST__
 322 /* Names of the signals.  This variable exists only for compatibility.
 323    Use `strsignal' instead (see <string.h>).  */
 324 #  define _sys_siglist sys_siglist
 325 extern __const char *__const sys_siglist[_NSIG];
 326 # endif
 327
 328 /* Structure passed to `sigvec'.  */
 329 struct sigvec
 330   {
 331     __sighandler_t sv_handler;  /* Signal handler.  */
 332     int sv_mask;                /* Mask of signals to be blocked.  */
 333
 334     int sv_flags;               /* Flags (see below).  */
 335 # define sv_onstack     sv_flags /* 4.2 BSD compatibility.  */
 336   };
 337
 338 /* Bits in `sv_flags'.  */
 339 # define SV_ONSTACK     (1 << 0)/* Take the signal on the signal stack.  */
 340 # define SV_INTERRUPT   (1 << 1)/* Do not restart system calls.  */
 341 # define SV_RESETHAND   (1 << 2)/* Reset handler to SIG_DFL on receipt.  */
 342
 343
 344 /* If VEC is non-NULL, set the handler for SIG to the `sv_handler' member
 345    of VEC.  The signals in `sv_mask' will be blocked while the handler runs.
 346    If the SV_RESETHAND bit is set in `sv_flags', the handler for SIG will be
 347    reset to SIG_DFL before `sv_handler' is entered.  If OVEC is non-NULL,
 348    it is filled in with the old information for SIG.  */
 349 extern int sigvec (int __sig, __const struct sigvec *__vec,
 350                    struct sigvec *__ovec) __THROW;
 351
 352
 353 /* Get machine-dependent `struct sigcontext' and signal subcodes.  */
 354 # include <bits/sigcontext.h>
 355
 356 /* Restore the state saved in SCP.  */
 357 extern int sigreturn (struct sigcontext *__scp) __THROW;
 358
 359 #endif /*  use BSD.  */
 360
 361
 362 #if defined __USE_BSD || defined __USE_XOPEN_EXTENDED
 363
 364 # ifdef __UCLIBC_SUSV4_LEGACY__
 365 /* If INTERRUPT is nonzero, make signal SIG interrupt system calls
 366    (causing them to fail with EINTR); if INTERRUPT is zero, make system
 367    calls be restarted after signal SIG.  */
 368 extern int siginterrupt (int __sig, int __interrupt) __THROW;
 369 # endif
 370
 371 # include <bits/sigstack.h>
 372 # ifdef __USE_XOPEN
 373 /* This will define `ucontext_t' and `mcontext_t'.  */
 374 /* SuSv4 obsoleted include/ucontext.h */
 375 #  include <sys/ucontext.h>
 376 # endif
 377
 378 # if 0
 379 /* Run signals handlers on the stack specified by SS (if not NULL).
 380    If OSS is not NULL, it is filled in with the old signal stack status.
 381    This interface is obsolete and on many platform not implemented.  */
 382 extern int sigstack (struct sigstack *__ss, struct sigstack *__oss)
 383      __THROW __attribute_deprecated__;
 384 # endif
 385
 386 /* Alternate signal handler stack interface.
 387    This interface should always be preferred over `sigstack'.  */
 388 extern int sigaltstack (__const struct sigaltstack *__restrict __ss,
 389                         struct sigaltstack *__restrict __oss) __THROW;
 390
 391 #endif /* use BSD or X/Open Unix.  */
 392
 393 #if defined __USE_XOPEN_EXTENDED && defined __UCLIBC_HAS_OBSOLETE_BSD_SIGNAL__
 394 /* Simplified interface for signal management.  */
 395
 396 /* Add SIG to the calling process' signal mask.  */
 397 extern int sighold (int __sig) __THROW;
 398
 399 /* Remove SIG from the calling process' signal mask.  */
 400 extern int sigrelse (int __sig) __THROW;
 401
 402 /* Set the disposition of SIG to SIG_IGN.  */
 403 extern int sigignore (int __sig) __THROW;
 404
 405 /* Set the disposition of SIG.  */
 406 extern __sighandler_t sigset (int __sig, __sighandler_t __disp) __THROW;
 407 #endif
 408
 409 #if defined __UCLIBC_HAS_THREADS__ && (defined __USE_POSIX199506 || defined __USE_UNIX98)
 410 /* Some of the functions for handling signals in threaded programs must
 411    be defined here.  */
 412 # include <bits/pthreadtypes.h>
 413 # include <bits/sigthread.h>
 414 #endif
 415
 416 /* The following functions are used internally in the C library and in
 417    other code which need deep insights.  */
 418
 419 /* Return number of available real-time signal with highest priority.  */
 420 extern int __libc_current_sigrtmin (void) __THROW;
 421 /* Return number of available real-time signal with lowest priority.  */
 422 extern int __libc_current_sigrtmax (void) __THROW;
 423
 424 #endif /* signal.h  */
 425
 426 __END_DECLS
 427
 428 #endif /* not signal.h */